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Elastic

Large Enterprises

Elastic is a search analytics company best known for the Elastic Stack (Elasticsearch, Kibana, Logstash, and Beats), which powers search, observability, and security use cases across large volumes of data. Its open-source technology is widely used for full-text search search enterprise search search, application monitoring, and log analytics.

2 interview notes · updated Jul 2026

Elastic·Software Engineer·Technical Phone Screen

Jul 2026
Elastic coding round for a software engineer role, one question the whole time: build a live log aggregation view in React. More involved than it sounds once you get into the timestamp handling and state update edge cases.
  • Build a React component that consumes a stream of log events one at a time, aggregates them by category in memory, and renders a live-updating table showing each category's event count and most recent timestamp.

“The core part wasn't hard to sketch out but I kept second-guessing the state structure.”

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Elastic·Software Engineer·Technical Phone Screen

Jun 2026
Elastic technical screen for a software engineer role, basically a live PR review on a recursive flatten utility. The whole thing was more nuanced than I expected, less about writing code and more about finding cracks in someone else's.
  • Given a pull request implementing a recursive array flatten function, what correctness bugs and edge cases does the implementation fail to handle?
  • What API and contract questions would you raise before approving this PR, for example around how non-array objects, null values, strings, and sparse arrays should be handled?
  • How would you improve this implementation for readability, performance, and safety, including the risk of a stack overflow on deeply nested input?
  • Propose a revised implementation approach and describe the minimal set of tests you would require before approving this PR.

“The `for...in` loop was the first thing I flagged because it iterates over enumerable properties, not just numeric indices, so anything added to Array.prototype would silently get included.”

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